Lettr

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Lettr is a modern email infrastructure platform that helps businesses reliably send, deliver, and track emails at scale. It offers both HTTP API and SMTP relay options to integrate email sending into apps, workflows, and systems, so teams don’t have to build or maintain their own email servers. Lettr handles everything from deliverability and open/click tracking to analytics and performance, allowing companies to focus on product and communication rather than underlying email delivery challenges. It’s designed to support both transactional and marketing-style emails, with robust documentation, deliverability tools, and comprehensive sending options for developers and operations teams.